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Constantine founds the new capital of the Roman Empire "Constantinople" and it would become the capital of the Byzantine Empire, renamed "Byzantium".
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The Western Empire collapsed because of Barbarian attacks.
The Eastern Empire survives and now is known as the Byzantine Empire. -
Justinian's reign begins. He reconquers parts of the fallen Western Empire (Africa and Italy, Spain). Justinian is the last emperor to use the title "Caesar".
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Is a great architectural beauty and an important monument for Byzantine Empire. Once a church, later a mosque, is complited after only five years of construction.
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The Empire changes its primary language to Greek.
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Heraclius become the new emperor of the Byzantine Empire.
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Leo III use the icons to represent their gods.
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The Latin Roman Church and the Greek Orthodox Church excommunicate each other.
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The First Crusade is proclaimed at Council of Clermont.
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Reconquest of southwestern Asia Minor.
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Byzantine Army defeated by the Sultanate of Rum at Myriokephalon. Hopes of regaining Asia Minor are lost.
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The Latin Empire of Constantinople is formed as well as many Byzantine successor states. The capture of Constantinople in 1204 was a blow from which the Byzantines never fully recovered
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The successor state of Nicaea recaptures Constantinople and restores the Byzantine Empire.
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Fall of Constantinople to the Ottomans. End of the Byzantine Empire
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The Roman Empire permanently splits after death of Theodosius, it splits into The Eastern and Western halves.
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Muslims attack Constantinople by land and sea.
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For the first time in 300 years, there is an emperor of the "East" and an emperor of the "West".
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Charlemagne is crowned as the new Emperor of the Romans.
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The Bulgars unsuccessfully attack Constantinople.
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Prince Igor of Kiev attacks Bithynia and later attacks Constantinople The Byzantines destroys the Russian fleet.
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He will reconquer Syria from the Muslims (995), Greece from Bulgars (996), and destroy the Bulgar army, earning the epithet Bulgaroktonos ("Bulgar Slayer"). (1014)
